海洋重防腐涂料及涂装体系现状及发展趋势

全面分析了我国船舶涂料、集装箱涂料、海洋资源开发及装备的防腐涂料涂装体系以及沿岸基础设施建设的防腐蚀保护涂料的现状及发展趋势。     

再谈“绿色涂装”——汽车“绿色涂装与涂料”的发展趋势（一）

在介绍国内汽车涂装的环保、节能减排现状及差距和＂绿色涂装＂理念（6个高效、10个更少、2个高效、1个更低）的基础上,按汽车涂装工艺推荐了26项成熟的先进适用的绿色涂装工艺技术。     

Green TPUs from Prepolymer Mixtures Designed by Controlling the Chemical Structure of Flexible Segments

This study concerns green thermoplastic polyurethanes (TPU) obtained by controlling the chemical structure of flexible segments. Two types of bio-based polyether polyols—poly(trimethylene glycol)s—with average molecular weights ca. 1000 and 2700 Da were used (PO3G1000 and PO3G2700, respectively). TPUs were prepared via a two-step method. Hard segments consisted of 4,4′-diphenylmethane diisocyanates and the bio-based 1,4-butanodiol (used as a chain extender and used to control the [NCO]/[OH] molar ratio). The impacts of the structure of flexible segments, the amount of each type of prepolymer, and the [NCO]/[OH] molar ratio on the chemical structure and selected properties of the TPUs were verified. By regulating the number of flexible segments of a given type, different selected properties of TPU materials were obtained. Thermal analysis confirmed the high thermal stability of the prepared materials and revealed that TPUs based on a higher amount of prepolymer synthesized from PO3G2700 have a tendency for cold crystallization. An increase in the amount of PO3G1000 at the flexible segments caused an increase in the tensile strength and decrease in the elongation at break. Melt flow index results demonstrated that the increase in the amount of prepolymer based on PO3G1000 resulted in TPUs favorable in terms of machining.     

未来环保涂料市场粉末涂料能否异军突起笑傲江湖

粉末涂料100%固体含量、零VOC,广泛应用于建筑铝型材、家用电器、管道防腐、钢筋防腐、金属家具等领域。在集装箱、汽车、卷材、家具、工程机械、船舶、钢结构这七大国家重点整治VOC排放领域,粉末涂料以其卓越的防腐与耐候特性,可实现真正的绿色涂装,其用量会大幅增长。但是在一些大型构件的现场施工中,粉末涂料涂装短期内难有用武之地。随着粉末涂料涂装技术的不断进步,粉末涂料将会有更多的应用空间。     

Rational Design of Ag/ZnO Hybrid Nanoparticles on Sericin/Agarose Composite Film for Enhanced Antimicrobial Applications

Silver-based hybrid nanomaterials are receiving increasing attention as potential alternatives for traditional antimicrobial agents. Here, we proposed a simple and eco-friendly strategy to efficiently assemble zinc oxide nanoparticles (ZnO) and silver nanoparticles (AgNPs) on sericin-agarose composite film to impart superior antimicrobial activity. Based on a layer-by-layer self-assembly strategy, AgNPs and ZnO were immobilized on sericin-agarose films using the adhesion property of polydopamine. Scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray powder diffraction spectroscopy were used to show the morphology of AgNPs and ZnO on the surface of the composite film and analyze the composition and structure of AgNPs and ZnO, respectively. Water contact angle, swelling ratio, and mechanical property were determined to characterize the hydrophilicity, water absorption ability, and mechanical properties of the composite films. In addition, the antibacterial activity of the composite film was evaluated against Gram-positive and Gram-negative bacteria. The results showed that the composite film not only has desirable hydrophilicity, high water absorption ability, and favorable mechanical properties but also exhibits excellent antimicrobial activity against both Gram-positive and Gram-negative bacteria. It has shown great potential as a novel antimicrobial biomaterial for wound dressing, artificial skin, and tissue engineering.     

High lumen density of Al2O3-LuAG: Ce composite ceramic for high-brightness display

Thermally robust and highly efficient green-emitting luminescent ceramics are gradually attracting great attention as promising phosphors using in high-brightness laser phosphor display to reduce serious speckle noise as well as high cost. However, lumen density is still seriously restricting their potential applications especially under high-power density laser due to insufficient absorption of blue laser and significant thermal quenching. Here, we report an Al₂O₃-LuAG: Ce composite ceramic phosphor (CCP) for high-brightness laser phosphor display. Owing to good optical properties and high thermal conductivity of Al₂O₃, the Al₂O₃-LuAG: Ce CCP shows high photoluminescence quantum yield (79.6%), low thermal quenching (only 3.2% loss in luminescence at 200°C), and high thermal conductivity (18.9 W·m⁻¹·K⁻¹). Moreover, the Al₂O₃, as scattering centers, enhances the Rayleigh–Mie scattering of the blue laser, and hence the absorption of the Al₂O₃-LuAG: Ce CCP exhibits a remarkable improvement (~2.3 times) at 450 nm. Finally, with optimized thickness (0.3 mm) of Al₂O₃-LuAG: Ce CCP, an excellent luminous efficiency (216 lm·W⁻¹) and outstanding lumen density (6129 lm·mm⁻²) of the green-emitting light source was obtained by driving under a high-power density (28.33 W·mm⁻²) blue laser. All of those validate the suitability of the Al₂O₃-LuAG: Ce CCP for high-brightness display.     

新型绿色Knoevenagel反应进展

Knoevenagel反应在有机化学中是很重要的一类缩合反应,能够在活泼亚甲基和羰基之间脱水形成碳碳双键,广泛应用于合成以及一锅法串联反应,在过去一直是有机化学家研究的热点。发展至今,很多关于Knoevenagel反应的研究都已经打破了传统有机化学的实验形式和反应条件。针对最近新发展的,符合绿色化学要求的新型Knoevenagel反应进行简单介绍。     

压实密度与烧成收缩率的探讨

探讨了压制成型后产品压实密度与烧成收缩率的关系，提出了在各种原材料烧失量稳定的情况下，用控制压实密度代替用控制压力来保证坯件收缩的新理念。     

绿岩型金矿地质特征成因及找矿方向初探

本文通过对加拿大赫姆洛金矿与吉林夹皮沟金矿的矿床地质特征及控矿条件的分析和讨论,认为两个矿床的成因类型均属前寒武纪绿岩型变质热液金矿床,并指出了在我国寻找本类矿床的方向。